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Orientation in Nematic Liquid Crystals Doped with Orange Dyes and Effect of Carbon Nanoparticles
Ahmet Alicilar*, Fatih Akkurt, Nihan Kaya
Chemical Engineering Department, Engineering Faculty, Gazi University, Maltepe 06570, Ankara, Turkey
Abstract:
Some properties of nematic liquid crystal E7 doped with two disperse orange dyes used together and effect of addition of carbon nanoparticles (single walled carbon nanotube or fullerene C60) on them were studied. Two dyes (disperse orange 11 and 13) having high solubility and order parameter were used as co-dopants. A notable increase in order pa-rameter was obtained comparing to that of liquid crystal doped with single dye. When carbon nanoparticles were used as dopant, a decrease in order parameter was observed at low temperatures while it increased at high temperatures. When applied voltage changed, the order parameter abruptly increased in its threshold value and saturated in higher voltages as expected. An appreciable change in textures was not observed with addition of dopants. This addition gave rise to an increase in nematic-isotropic phase transition temperatures compared with that of pure liquid crystal.
Key words:  Liquid crystal, Disperse orange dye, Carbon nanoparticle, Order parameter
FundProject:
Orientation in Nematic Liquid Crystals Doped with Orange Dyes and Effect of Carbon Nanoparticles
Ahmet Alicilar*, Fatih Akkurt, Nihan Kaya
加辛大学工学院化学工程系,马尔泰佩,安卡拉06570
摘要:
研究了掺杂两种分散染料橙的向列型液晶E7的性质以及碳纳米粒子(单壁碳纳米管或富勒烯C60)的影响. 两种分散染料橙11和13具有较高的溶解度和有序参数,被作为掺杂剂同时使用. 与掺杂单染料相比,同时加入两种染料橙使液晶的有序参数明显提高. 与纯液晶相比,掺杂可引起向列相向各向同性相转变温度的升高.
关键词:  液晶,分散染料橙,碳纳米粒子,有序参数
DOI:10.1088/1674-0068/23/03/368-372
分类号: